/*
 * Copyright 2002-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.security.web.authentication.preauth;

import javax.servlet.http.HttpServletRequest;

import org.springframework.util.Assert;

public class RequestHeaderAuthenticationFilter extends AbstractPreAuthenticatedProcessingFilter {
    private String principalRequestHeader = "SM_USER";
    private String credentialsRequestHeader;
    private boolean exceptionIfHeaderMissing = true;

    protected Object getPreAuthenticatedPrincipal(HttpServletRequest request) {
        String principal = request.getHeader(principalRequestHeader);
        if (principal == null && exceptionIfHeaderMissing) {
            throw new PreAuthenticatedCredentialsNotFoundException(principalRequestHeader + " header not found in request.");
        }
        return principal;
    }

    protected Object getPreAuthenticatedCredentials(HttpServletRequest request) {
        if (credentialsRequestHeader != null) {
            return request.getHeader(credentialsRequestHeader);
        }
        return "N/A";
    }

    public void setPrincipalRequestHeader(String principalRequestHeader) {
        Assert.hasText(principalRequestHeader, "principalRequestHeader must not be empty or null");
        this.principalRequestHeader = principalRequestHeader;
    }

    public void setCredentialsRequestHeader(String credentialsRequestHeader) {
        Assert.hasText(credentialsRequestHeader, "credentialsRequestHeader must not be empty or null");
        this.credentialsRequestHeader = credentialsRequestHeader;
    }

    public void setExceptionIfHeaderMissing(boolean exceptionIfHeaderMissing) {
        this.exceptionIfHeaderMissing = exceptionIfHeaderMissing;
    }
}
